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Thevenin technique solving problem -- getting wrong answer

  1. Apr 15, 2015 #1
    Hi

    Can you tell me please what I am doing wrong here
    upload_2015-4-15_16-15-57.png
    I need to find the Vc function after we close the switch.
    To do this, I calculate the Thevenin equivalent circuit.
    I calculate Vth to be 21/(60+30) times 30, which makes 0.7V but why the answer is 7V????
    Basically the answer is Vc=7x(.... which means that final voltage of capacitor is 7V and not 0.7V.
    Any idea?

    thanks
     
  2. jcsd
  3. Apr 15, 2015 #2
    Ehm hm, 30x(21/(60+30))=7
     
  4. Apr 15, 2015 #3
    I am embarassed
     
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